Explain Kirchhoff’s laws.

1 Answer

Answer :

Kirchhoff’s laws are used in complex network circuits to determine the equivalent total resistance and the current flowing in various conductors of that circuit.
 Mainly there are two laws.
a. Point law or current law.
b. Mesh law or voltage law.
 Point law or current law.
The point law states that, the algebraic sum of the currents meeting at any point or junction or node of a network is zero. In other words the sum of the currents flowing towards the junction or node or any point of network is equal to the total current flowing away from that junction.
 Mesh law or voltage law.
The mesh law states that, in any closed electrical circuit the algebraic sum of the potential drops is equal to the sum of the impressed emf’s acting in that close circuit. In this the important factor is to determine the emf sign to calculate the total emf.

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Description : If the total source voltage of the three-wire distribution system shown in the illustration is 240 volts, what is the voltage across load L5? [ NOTE: Kirchhoff's voltage and current laws apply ] EL-0075 A. 110.4 volts B. 112.2 volts C. 113.0 volts D. 114.8 volts

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